You don't need an add-in to do a normal mailmerge.

Conversely, you just want to link the document to one set of Excel cells, so the document content updates when the Excel data are changed, all you need do is copy the cells concerned and paste them into Word using Paste Special with the 'paste link' option and your preferred paste format.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]